Thermodynamics

Which direction does energy flow?

• From hotter to cooler

• From cooler to hotter

• Energy does not flow

Which state of matter has the most thermal energy in its molecules?

• Solid

• Liquid

• Gas

• They all have the same enrgy

Which is true about an egg cooking in a pot of water on the stove? Check all that are correct

• The egg is the system

• The egg is the surrounding

• The pot of water is the system

• The pot of water is the surrounding

Which direction is energy flowing when an egg is cooking in a pot of water on the stove?

• From the egg to the water

• From the water to the egg

• Energy is not flowing

Water on a lake is freezing. Which direction is the energy moving?

• From the water to the air

• From the air to the water

• Energy is not moving

You have two blocks of ice. One is much larger than the other. What is true about the two blocks of ice? Choose all that are correct.

• They have the same temperature

• They have different temperatures

• They have the same amount of heat

• They have different amounts of heat

Which is true about the amount of heat in a substance?

• It is the total amount (sum) of heat energy in all of the molecules

• It is the average amount of energy in all of the molecules

• The amount of heat is equal to the temperature.

Which of the following will increase the speed of a reaction? Check all that are correct.

• Add more reactants

• Make the reaction colder

• Increase the surface area.

• Increase the size of the container where the reaction is occurring

Which of the following will decrease the speed of a reaction? Check all that are correct.

• Add less reactants

• Make the reaction colder

• Increase the surface area.

• Decrease the size of the container where the reaction is occurring

Which is true about the temperature of a substance?

• It is the total amount (sum) of heat energy in all of the molecules

• It is the average amount of energy in all of the molecules

• The amount of heat is equal to the temperature.